The phrase "keeping posted" means to stay informed or up-to-date with something. Some antonyms for this phrase could include ignoring, neglecting, disregarding, or being uninformed. When someone is ignoring or neglecting a certain topic, they are not keeping posted on it. Similarly, if someone is disregarding a piece of information, they are not keeping posted on it or taking it into consideration. Being uninformed, on the other hand, implies a lack of knowledge or awareness, making it impossible to keep posted on a particular subject. It's important to strive for understanding and keeping informed in order to make well-informed decisions and contribute positively to the world around us.